| 摘要 |
Constructed in a cylindrical body (10) are a central chamber (16) fitted with a release hole (24) and two opposing chambers (18, 20). The ends of a floating piston (26) are engaged in these opposed chambers and subjected to both the pressure to be controlled and a reference pressure. A cylindrical box (34) integral to the piston (26) slides in the central chamber (16). In the closed position, the box (34) closes the release hole (24) to form a seal and the piston (26) closes the chamber under control (18) without forming a sealed closure. In the open position, a radial hole (48) cut in the wall of the box (34) is opposite the release hole (24). A decompression of the central chamber (16) is obtained as the valve starts to open (narrow channels 52) and a deceleration of the box (34) is obtained at the end of this opening (hole 44 and stud 54). Applications: Pressure relief valve for the oil industry, reactionless valve, pressure control nozzle.
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